The GATT was originally created in 1946 to work out international agreements on world merchandise trade. Since then there have been several "rounds" of the GATT. While serious trademark discussions occurred in the Tokyo Round of the 70's and again in the '80s, it wasn't until the Geneva Round in which TRIPs (Trade Related aspects of Intellectual Property) marked a true involvement of GATT into the area of intellectual property. The WTO (World Trade Organization) and the TRIPs Council monitor the implementation of TRIPs and its enforcement mechanisms. One of the specific changes to U.S. law arising out of GATT are the 1995 amendments to Lanham Act. Specifically section 2(a) was amended to include a prohibition against the registration of any geographical mark for wines or spirits not from the place indicated in the mark.
